What Is an Aggregation Switch? An aggregation switch is a network device that consolidates traffic from multiple access switches, wireless access points, or other edge devices and forwards it to core switches or routers. The three layers of a traditional three-layer network design are the core layer, aggregation layer, and access layer. By combining multiple switches into a cohesive system, organizations can improve efficiency, scalability, and management. This article looks at what each such tool does, compares how they differ from each other, and offers suggestions as to what sort of network each.